Improved kock-deill



JOSEPH PEE VY, OF ORONO MAINE.

Letters Patent No. 76,242, dated JtIgm-h 31, 1868.

IMPROVED ROCK-DRILL.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOSEPH PEEVY, of Orono, in the county of Penobscot, and State of Maine, have invented an Improvementin Machines for Drilling Rock; and I lo hereby declare that the following is a full, clear, and exact description of the construction and operation-of the same, reference being had to the annexed drawings, with letters of reference marked thereon, making a part of this specification, oi which Figure 1 is a perspective view, with a portion of the side frame removed.

Figure 2, an apparatus for imparting a rotary motion'to he drill; and

Figure3, a view of the point 'of' the drill. v

This invention consists of a mechanism for drilling rocks, the main features of which are a walking-beam, resting on an adjustable support, and a device for automatically rotating the cutting-instrument, as will hereinafter more fully appear. I

To enable those skilled'in the art to make and use my invention, I will proceed to describe its construction and operation.- l I represents a walking-beam, supported on the forked post a by means of a pivot. The connecting-rod d, jointed at its upper end to one extremity of said beam in the usual manner, is connected at its lower end to a crank, c, on a shaft, d; the latter being supported in suitable bearings in theuprights B B- of the frame of the machine. On one end of the shaft (1 is placed a pinion, e, matching with a spur-wheel, h, supported in suitable bearings higher on the upright B, said spur-wheel being provided with a crank, z", to which power is applied from the motor. To the other end of the shaft d is applied 'a balance-wheel, Z, which I, propose shall bea grindstone. To the opposite extremity of the walking-beam A is attached one end 0? a piece of elastic metal, is, bifurcated at its other end, within which bifurcation is received the drill-shank m, on which are placed' two.

collars, n n, one just above the end-of the spring is, and the other just below it. These collars are intended to be connected by a piece of tubing, and to be fastened to the drill-shank, at any point, by a set-screw, in such manner that they may be moved up or down thereon, by which-means the length of the drill-shank may be practically increased or decreased at pleasure The upper collar, 72, is provided on its under side with teeth, at", so cut as to match with teeth 70 on the upper side of one of the forks of the spring it. By this means the automatic rotation of the drill is effected, for,'as the spring is is raised by the action of the walliing-beam, since the drill-shank moves only in a vertical plane, being held therein by guides do, on the uprights C C of the frame, the. said spring, as it moves upward, moves also backward, in relation to said shank, and its teeth, It, acting on the teeth a of the collar 72, cause the shank'to turn by the space of one notchat each upward movement.

The point of my drill is forked, as shown atr 1', fig. 3, the two spurs projecting outward at each corner, for the purpose of enabling the drill to'pass ascam in the rock it maybe cutting through, without being thereby made to deviate-from its true vertical course. The lower part of the post a, which supports the walking-beam A, enters a hole in the sill D, and rests upon a bar, a, of the' proper strength, which passes through an orifice in the post a, and through an orifice, t, in the sill D. There n-re two or more orifices t in the sill D, one above another, through either of which the bar 8 maybe passed, by which means the height of the walking-beam above the .sill may be increased or diminished at pleasure. By setting the post a at its lowest point, and the collars n at at their highest point, the depth to which the drill may be made to attain may be greatly increased.

The use of the s'pringbar 7c is to diminish the shock on the apparatus when the lifting-strain commences. This it does to a very material extent, operating to a great-advantage, andpreventing weakening and breakage of the parts.

Having thus fully described my invention, what I claim as new, and desire to securc by Letters Patent, is-

1. The adjustable andnotched collars 1t 12-, in combination with the drill-shank m and the bifurcated and notched shaft is, as and for the purpose set forth;

2. The spring arm is, in combination with the walking-beamA and the drill-rod, as and for the purpose set forth. JOSEPH PEEVY.

Witnesses:

FRED. W. HILL, Nuwrow E. Bonny. 

